Dumping motor-truck.



C. LYNCH.

DUMPING MOTOR TRUCK. APPLICATION FILED AUG.26,Y 1912.

1 15mm Patented Oct. 19, 1915 2 SHEETS-SHEET I.

C. LYNCH.

DUMPlNG MOTOR TRUCK.

4 APPLLCATIQN FILED AUG.26. 1912.

Patented Oct. 19, 1915 2 SHEETS-SHEET 2.

JHIHIHLI CHARLES LYNCH, OF HAMMOND, INDIANA.

DUMPING MOTOR-TRUCK.

Application filed August 26, 1912.

To all whom it may concern:

Be it known that I, CHARLES LYNCH, a citizen of the United States, residing at Hammond, in the county of Lake and State of Indiana, have invented certain new and useful Improvements in Dumping Motor- Trucks, of which the following is a specification.

My present invention relates to motor trucks of the dumping type, and has referonce more particularly to that style or type of dumping trucks wherein the tilting body is hinged to and across the rear end of the motor truck frame, and discharges the load from the rear.

The chief object of my present invention is to provide a simple, reliable, and highly efficient mechanism, preferably operated by the power of the motor of the truck, for tilting the body by raising and-lowering its forward end, and a mechanism which shall be self-locking in all positions.

My invention also includes a novel improvement in the truck body itself, adapting the latter to be used either as an ordinary tilting body on the motor truck frame, or to lines.

be bodily raised from the truck frame by' a suitable derrick or other hoisting apparatus and swung to and above the desired point of discharge.

my invention, its mode of operation and its advantages will all be readily understood when considered in connection with the accompanying drawings, which illustrate one practical form in which the invention may be embodied, and in which Figure 1 is a side elevational view of the complete truck, the tilted or dumping position of the body being indicated by dotted Figs. 2 and3 are longitudinal and transverse sections through the bottom of the body. Fig. 4 is a front elevational view of the power-operated mechanism for tilting the body. Fig. 5 is a side elevational view of the same. Fig. 6 is a top plan view of the same. Fig. 7 is a detail front elevation showing the shiftable eccentric bearing of the forward end of the transmission shaft. Fig. 8 is an enlarged cross section on the line 88 of Fig. 6.

Referring to the drawings, 10 designates as an entirety the motor truck frame, to and across the rear end of which is pivoted at 11 a body designated as an entirety by 12. This body may be of the usual rectangular form having side, bottom and front end Specification of Letters Patent.

Patented (lot. 119, 1915.

Serial No. 716,976.

' walls, and open at its rear end. In the preferred form herein shown, the body comprises a suitably stiffened metal box-like structure having a hinged rear end closure or tail-gate 13 and resting upon a skeleton bottom frame 1 1 (Figs. 2 and To prevent longitudinal or lateral displacement of the box-like superstructure from the skeleton sub-frame, while permitting the former to be lifted off the latter, I provide on the metal floor of the superstructure longitudinal ribs 15 that engage grooves or kerfs 16 in the cross timbers of the subframe, as shown in Fig. 3, and, at their ends, abut against the end timbers of said subframe, as clearly shown in Fig. 2. The tailgate 13 is pivoted to the sides of the body at 17, and has forwardly projecting arms 18, the forward ends of which are connected bylinks 19 to the sides of the truck frame 10, as at 20, whereby the tilting of the body automatically opens the tail-gate for the dis charge of the load, as clearly illustrated by dotted lines in Fig. 1.

Referring now to my improved mechanism for effecting the tilting of the body, 21 desig- .ture 14 of the body. Rigid with the arms 24 are a pair of segment racks 26, with which mesh pinions 27 keyed on the outer ends of the shaft 23; and fast on the shaft 23, between the side uprights 21 is a wormwheel 28. I

J ournaled in and across a horizontal frame 29 (Fig. 6), which forms a base support for the side uprights 21, is a transmisloo sion shaft 30. The forward end of this shaft has an eccentric bearing in a journal sleeve 31 in turn mounted in a bearing bracket 32 secured to the frame 29, as clearly shown in detail view, "Fig. 7 Fast on the journal sleeve 31 is a lever 33 that extends upwardly to within reach of the driver, as shown in Fig. 1. Fast on the transmission shaft 30 is a sprocket wheel 34 and a spur pinion 35. The sprocket Wheel 34: drives, through a chain 36, a large sprocket wheel 37 loose on a countershaft 38; and the spur pinion 35 drives a spur gear 39 also loose on the countershaft 38. Splined on the countershaft 38 (Fig. 8) by a feather 40 is a doubleended clutch member 41, the two faces of which are adapted to alternately engage cooperating clutch members 42 and 43 fast with the sprocket wheel 37 and the spur gear 39, respectively; whereby either of the latter may be placed in driving relation to the countershaft38 by the actuation of a clutch lever 44 that extends up to within reach of the driver, as shown in Fig. 1. Fast on the countershaft 38 is a worm 45 that engages and drives the worm-wheel 28 on the shaft 23.

On the forward end of the transmission shaft 30 is a friction wheel 46 that is adapted to be thrown into and out of driven relation to the fly wheel 47 of the engine by suitable shifting of the lever 33.

It is evident that the chain and sprocket and spur gear transmissions between the shafts 30 and 38 serve, when coupled to the latter shaft, to drive the same in opposite directions. Hence, when the driver desires to tilt the body for the dumping of the load, he first throws the friction wheel 46 into engagement with the engine fly wheel 47 by means of the lever 33, and he then, by means of the clutch lever 44, shifts the clutch 41 into engagement. with either the sprocket wheel 37 or the spur gear 39, accordingly as one or the other imparts the proper rotation to the worm'45 to effect an upwardly swinging movement of the lifting arms 24; the

clutch being reversely shifted when it is desired to effect a lowering and leveling movement of the body.

It will be observed that the power-transmitting mechanism includes the worm 45 and the worm-gear 28 when operating in both directions; and it is well known that a worm-gear drive is self-locking in all positions, thus making it unnecessary to provide dogs, ratchets, or other detents, for holding the body in elevated position when dumping. From the foregoing it will be seen that the power mechanism for effecting the tilting of the body is simple and positive in action and under the complete control of the driver in his seat. In the form of body herein shown, wherein the box-like superstructure rests upon a bottom frame that is pivoted to the truck frame, and is removable from said bottom frame, I attach to the upper edges of this box-like superstructure and its tail-gate rings or eyes 48 and 49, to which hoisting chains or cables from an overhead derrick may be attached; it being necessary only, when dumping the load by means of a derrick, to disconnect the tail-gate operating links 19 from the arms 18.

While I have described the preferred embodiment of my invention, it will be manifest to those skilled in the art that the mechanism may be modified in detail to suit particular conditions and differing truck-frame structures without involving any departure from the invention or sacrificing any of the advantages thereof.

I claim- 1. In a dumping motor truck, a truck frame, a tilting body pivoted in rear of its longitudinal center to and across the rear end of the truck frame, a shaft mounted in and between side uprights of the truck frame, a pair of arms on said shaft, thrust links connecting the free ends of said arms with the forward portion of said body, segment racks rigid with said arms, a second shaft carrying pinions meshing with said segment racks, and mechanism for turning said last-named shaft in both directions.

2. In a dumping motor truck, a truck frame, a tilting body pivoted in rear of its longitudinal center to and across the rear end of said truck frame, a shaft mounted in and between side uprights of the truck frame, a pair of arms on said shaft, thrust links connecting the free ends of said arms with the forward portion of said body, segment racks rigid with said arms, a second shaft carrying pinions meshing with said segment racks, and a worm-gear drive for said last-named shaft.

3;. In a dumping motor-truck, the combi-- nation with the truck-frame, of a tilting body pivoted to and across the rear end of said truck-frame, a shaft mounted in and between side-uprights of the truck-frame, a pair of arms on said shaft, thrust-links connecting the free ends of said arms with the forward portion of said body, segmentracks rigid with said arms, a second shaft carrying pinions meshing with said segment-racks, and power mechanism for turning said last-named shaft in both directions, said power mechanism including a friction-wheel and means for shifting the latter into and ou-tof driven engagement with the engine fly-wheel of the motortruck.

CHARLES LYNCH. Witnesses:

SAMUEL N. POND, MARY M. LErPo. 

